Ms310 compression

[ktm250rider]

Can someone tell me what the compression should be for a still ms310? Trying to figure out if it's low on power or just me. Seems to be bogging down even with a new 18" chain.

 

[Canthook Coasty]

Can someone tell me what the compression should be for a still ms310? Trying to figure out if it's low on power or just me. Seems to be bogging down even with a new 18" chain.

What are you getting? Mine was at 160 the last time I had it checked ( about a month ago) with about 35 tanks of gas through it and four years old.

 

[ktm250rider]

Havent gotten to it yet. Mine is still original. Lots of hours on it.

 

[sefh3]

100 psi the saw will run (not strong but will run)
120-140 psi + the saw should run but feel weak
140-160 psi is perfect.

These are best estimates though. Get yours and go from there.

 

[fidiro]

Have you owned it for a while? Have you ever tuned it?

 

[ktm250rider]

I've had it for about 8 years with most of it's use over the past 5 years.

 

[fidiro]

When was the last time you adjusted the carb? It could be just a tune that it needs.

Also, overtime the carb diaphram can go bad and you may need a carb kit, if you have never rebuilt the carb you really should do it as it's only about $7 for a kit and fairly easy to do.

If you say you have lots of hours on it, I would pull the muffler and check piston.

 

[nmurph]

that saw should be at 150psi. any lower and it is beginning to lose compression.

 

[ktm250rider]

Well i got 150. Air filter was a mess. Cleaned and ready to try tomorrow.